Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
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Page 40
Notice
When using wormhole, if the end device returns an exception response the D77D-EMA
will respond to the master with a 0B indicating there is no response from the end
Modbus device.
Pass-Through Setup
When configuring either Channel A or Channel B as a Pass-Through, it is important to set
up the properties of the network so it matches the properties of the slave devices being
communicated to. What will need to be configured are minimally the baud rate and the
parity. The following chart has all the properties of the Modbus network that can be
edited. Since either Channel A or Channel B can be configured as a Modbus, which ever
channel is used is required to be configured. Once the configuration is set, the values
are set in non-volatile memory and stored through a power cycle.
Table 39 Register Settings for Pass-Through Channel Setup
Description Modbus
Register
Size
Usage
Read/
Write
QCPort Channel A
Modbus Parity
7547
1
Even = 0
Odd = 1
None = 2 (default)
R/W
QCPort Channel A
Modbus baud.
7548 1
1200
=
384
2400 = 192
4800 = 96
9600 = 48
19200 = 24 = (default)
38400 = 12
57600 = 8
115200 = 4
230400 = 2
460800 = 1
R/W
QCPort Channel B
Modbus Parity
7552
1
Even = 0
Odd = 1
None = 2 (default)
R/W
QCPort Channel B
Modbus baud
7553 1
1200
=
384
2400 = 192
4800 = 96
9600 = 48
19200 = 24 = (default)
38400 = 12
57600 = 8
115200 = 4
230400 = 2
460800 = 1
R/W